How to Garden Phos? Stem Rot

[JJC18]

A few helpful forum individuals recommended Garden Phos to help with possible stem rot.

The question is how do I use it? The instructions for strawberries and other crops is to mix 2 tablespoons to a gallon of water.

I have a small spray canister I can use maybe 1 or less tablespoons on to preserve a certain ratio.

This seems excessive for my smaller dying phal. I am hoping the stem may be still alive in the lower portions for a new growth despite the crown being lost.

Any advice would be appreciated.

J